Re: [http-state] Assumed Vary: Cookie
Julian Reschke <julian.reschke@gmx.de> Fri, 21 November 2014 14:25 UTC
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Date: Fri, 21 Nov 2014 15:24:44 +0100
From: Julian Reschke <julian.reschke@gmx.de>
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To: Bjoern Hoehrmann <derhoermi@gmx.net>, Anne van Kesteren <annevk@annevk.nl>
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Cc: Boris Zbarsky <bzbarsky@mit.edu>, http-state@ietf.org
Subject: Re: [http-state] Assumed Vary: Cookie
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On 2014-11-21 15:13, Bjoern Hoehrmann wrote: > * Anne van Kesteren wrote: >> RFC 6265 does not really explain the relationship to the HTTP cache >> and how this is somewhat special for cookies. In particular, >> implementations assume that a different value for the Cookie request >> header means the cache cannot be reused. Can errata be issued? >> >> For additional context: >> >> http://lists.w3.org/Archives/Public/ietf-http-wg/2009AprJun/0464.html >> https://bugzilla.mozilla.org/show_bug.cgi?id=1075297#c5 > > It seems that implementations vary in what assumptions they make about > server responses when sending or omitting a `Cookie` header in requests. > Even for the dominant web browsers there does not seem to be a common > reliable behavior, and I am sure there are non-browser caches that do > not assume `Vary: Cookie`. So it's not obvious to me what the document > should say on the matter. What it currently says is (a) intentional and (b) consistent with the relevant HTTP spec (<http://greenbytes.de/tech/webdav/rfc6265.html#rfc.section.3.p.3>): "The presence of a Cookie or a Set-Cookie header field does not preclude HTTP caches from storing and reusing a response." Furthermore, Anne says: "...that a different value for the Cookie request header means the cache cannot be reused. ..." If a resource varies on "Cookie", it will also vary on the *absence* of Cookie (which in general would imply non-authenticated access if the cookie was used to identify the user). So that would need to be made very clear. I'm ok with a potential revision of RFC 6265 *mentioning* the caching heuristics that are in common use, but right now I don't see a normative requirement coming out of that. > (And as an aside, for the specific bug report above, it seems Chrome's > behavior is better than that of Firefox, but Mozilla does not seem in- > terested in aligning their implementation with Chrome in this regard.) Pointer? Best regards, Julian
- [http-state] Assumed Vary: Cookie Anne van Kesteren
- Re: [http-state] Assumed Vary: Cookie Bjoern Hoehrmann
- Re: [http-state] Assumed Vary: Cookie Julian Reschke